Microsoft Excel depends on data that’s stored correctly. If you receive text values that should be real numbers, use one of these methods to get you back to the real work.

To begin, create or open the spreadsheet in Numbers and click on File > Export to > Excel. Next, you can select the file format you want. Choose .xlsx for the newer version of Microsoft Office ...

Click on "Save As" from the "File" or "Windows Button" menu in Excel then choose the "Other Formats" option and choose "Unicode Text" as the file type. Type a file name into the "File Name" box ...